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RISS 인기검색어
- 검색키워드
- 저자 : Subhankar Maity (검색결과 2 건)
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Polypyrrole Coated Textiles as Photothermal Material for Interfacial Solar Evaporation
Subhankar Maity,Madhu Yadav,Arun Kumar Patra 한국섬유공학회 2023 Fibers and polymers Vol.24 No.10
Solar evaporation is a primitive skill that has regained tremendous attention because of the sufficiency of solar energy and water sources on Earth. Textile materials are suitable for solar evaporation because of their porous structure with micro-channels, promoting moisture wicking, low heat conductivity and good solar absorptivity. The absorptivity and solar evaporation performance of textile materials can be improved by coating a suitable photothermal material like polypyrrole (PPy). In the present research, PPy is coated onto various woven and spunlace nonwoven fabrics by in-situ chemical polymerization to develop functional textiles for efficient photothermal conversion. Optical and electron microscopy studies confirms that the polymerization proceeded smoothly, resulting in the formation of a uniform layer of PPy around the individual fibres and as well as trapped in fibre interstices. PPy-coated 100% viscose spunlace nonwoven fabric (with 22.3% PPy add-on) shows maximum light absorbance ability (K/S value 7.543) exhibiting the rise of surface temperature upto 71 °C after exposure of 5 min to sunlight. The maximum water evaporation rate is obtained in case of PPy coated 100% viscose nonwoven (3.343 kgm-2 h-1), followed by 50:50 blended polyester/viscose nonwoven (2.400 kgm-2 h-1), 100% polyester nonwoven (1.683 kgm-2 h-1) and cotton woven fabrics (1.867 kgm-2 h-1). FTIR studies reveal significant intermolecular interaction (-H bonds) between cellulosic molecules and PPy. Such PPy-coated textile material can be a potential candidate for water desalination and purification to address the issue of water scarcity by effective utilization of solar radiation.
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Subhankar Maity,Sandeep Tiwari,Prashant Vishnoi 한국섬유공학회 2023 Fibers and polymers Vol.24 No.9
Multifunctional and durable nano-coating of titanium dioxide (TiO2) on cotton and silk fabric surface has been achieved via sol–gel method in aqueous medium at room temperature. The nanosol is coated on fabric surface by pad-dry-cure method using 1% acrylic binder to achieve durable coating. The coated fabrics are characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray powder diffractometry (XRD), optical microscopy, and scanning electron microscopy (SEM). The performance of the coated fabrics against self-cleaning efficiency and UV protection is evaluated. The self-cleaning efficiency is assessed against the artificial stain of Schezwan chutney, coffee, Coca-Cola, and turmeric. Maximum stain removal efficiency is achieved with coffee stain with 81.25% and 96.63% for cotton and silk fabrics, respectively, after exposure to 20 h of sunlight. However, tensile strength and elongation of the coated fabrics decrease after the exposure to sunlight. The average size of the TiO2 particles formulated in the nanosol is found to be about 5 nm which is sufficient for scattering the UV radiation from the textile surface. The self-cleaning effect and UPF of nanosol-treated silk fabric are found to be better than that of cotton fabric. UPF of treated cotton and silk fabric is found to be 53.87 and 61.79, respectively.
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